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（1 同濟(jì)大學(xué)建筑工程系，上海 200092；2 同濟(jì)大學(xué)先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗(yàn)室，上海 200092；3 上海同吉建筑工程設(shè)計(jì)有限公司，上海 200092；4 上海建筑設(shè)計(jì)研究院有限公司，上海 200041）

［摘要］某綜合體育館訓(xùn)練場(chǎng)為大跨度預(yù)應(yīng)力混凝土框架結(jié)構(gòu)，其主梁次彎矩值與按平面框架結(jié)構(gòu)計(jì)算的結(jié)果存在較大差異，主梁次軸力最大值占主軸力的89%。利用有限元分析研究了該結(jié)構(gòu)次彎矩的分布特點(diǎn)，并分析了原因。橫向各榀框架的豎向位移通過次梁相互影響，次梁在端部受到的框架柱和非預(yù)應(yīng)梁的強(qiáng)約束加劇了這種影響。按平面框架計(jì)算的次彎矩與空間框架計(jì)算的結(jié)果相比，最大誤差達(dá)到1 435%。影響主梁次彎矩的主要因素是次梁的截面尺寸和主梁跨度，次梁預(yù)應(yīng)力筋配筋量的影響很小。最后，根據(jù)次彎矩分布特點(diǎn)對(duì)設(shè)計(jì)提出了建議。

［關(guān)鍵詞］預(yù)應(yīng)力；次內(nèi)力；空間性能；約束分布

中圖分類號(hào)：TU378.2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)03-0055-04

Study and analysis of secondary internal force of pre-stressed main beam in the

 training place of a comprehensive gymnasium

Xiong Xueyu^1,2, Lü Pin¹, Gu Wei^1,3, Li Yaming⁴

(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 200092, China; 3 Shanghai Tongji Construction Engineering Design Ltd., Shanghai 200092, China; 4 Shanghai Institute of Architecture Design ＆ ResearchLtd., Shanghai 200041, China)

Abstract:The training place of a comprehensive gymnasium is a large-span pre-stressed concrete frame structure, in which secondary moment of the main beam is quite different from the results calculated through plane frame model, and the maximum secondary axial force accounts for 8.9 percent of the primary axial force. The characteristic of the secondary moment was analyzed through FEA. The vertical displacements of lateral frames interact through secondary beams, and strong constraint to secondary beams produced by columns and frame beams exacerbates this effect.The maximum percentage error of secondary moment is 1435 percent. Main factors affecting the secondary moment are the size of secondary beam section and span of the main beam, while the pre-stress reinforcement ratio of secondary beam has little effect. At last, suggestions were proposed for design.

Keywords:pre-stress; secondary internal force; spatial action; distribution of constraint

*中華人民共和國行業(yè)標(biāo)準(zhǔn)《預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》研究項(xiàng)目，上海市科委科技支撐計(jì)劃資助項(xiàng)目（09231201102），上海市科委《現(xiàn)代預(yù)應(yīng)力成套技術(shù)》資助項(xiàng)目（0907H194200），高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金（20090072110051）資助項(xiàng)目，合肥市重點(diǎn)工程建設(shè)管理局科研項(xiàng)目（2010CGAZ0669）。

作者簡介：熊學(xué)玉，教授，博士，博士生導(dǎo)師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：xiong_xueyu@tjpec.com。

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［5］孟少平，吳京，呂志濤. 預(yù)應(yīng)力混凝土井式梁和雙向板中次彎矩的計(jì)算［J］. 建筑結(jié)構(gòu)，1998，28(12)：37-39.